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Carbon-Carbon composite has a cycle life in the millions when cyclically loaded between 0% and 85% of ultimate tensile strength. Furthermore, that material has
by namibj 6y ago
Carbon-Carbon composite has a cycle life in the millions when cyclically loaded between 0% and 85% of ultimate tensile strength.
Furthermore, that material has a very low thermal expansion coefficient and remains structurally sound at high temperatures.
It does oxidize at high temperature, so you'll have to coat it with something. It's also fairly brittle, basically a strong ceramic (it caused us to loose Columbia during re-entry).
- mycall 6y agoWhat is the difference between "Carbon" and "Carbon-Carbon"? It seems incongruous.
- ygra 6y agoI think this is this: https://en.wikipedia.org/wiki/Reinforced_carbon%E2%80%93carbon https://en.wikipedia.org/wiki/Reinforced_carbon%E2%80%93carb... which is carbon-fiber in graphite, apparently, so the name is apt in that it's a composite of two different forms of carbon with different properties.
- namibj 6y agoYes. It's a heterogeneous allotrope made from typically pyrolyzing the matrix, followed by slowly decomposing Acetylene inside the porous structure until the porosity is gone. Other ways are to just infuse the porous matrix with more resin, before pyrolyzing again. Then loop a (few) dozen times.
- HPsquared 6y agoThere's plain old "carbon fiber" which is short for carbon fiber reinforced polymer/plastic (CFRP). This is the much more common type, and is a polymer matrix reinforced by carbon fibers. This is very strong and light, but not terribly heat-resistant. In a carbon-carbon composite, on the other hand, the plastic component is also replaced by graphite. This gives a very strong and heat-resistant, though somewhat more brittle, material.